ビニロン短繊維を混入したＲＣ梁の耐衝撃性に及ぼす短繊維混入率の影響

概要

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In order to investigate the upgrading effects of impact resistant capacity for shear failure type RC beams due to mixing Vinylon short-fiber, static and falling-weight impact tests were conducted taking a mixed fiber ratio Vf in volume as variable. Here, the impact test was conducted using a 300 kg steel weight and following iterative loading method with 1 m/s initial and incremental impact velocity of steel weight. The results obtained from this study are as follows; 1) the larger the Vf ratio, the greater the static and impact resistant capacity due to bridge effects of the short-fiber; 2) when the mixed fiber ratio Vf was increased by 1, 2, and 3%, impact resistant capacity of the RC beam was improved by 1.7, 2.3, and 3.1 times with reference to that of normal RC beam, respectively; 3) failure mode of the RC beams was shifted from shear failure type to flexural failure type due to increasing in mixed fiber ratio Vf of the short-fiber.